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CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323508 The correct statement (s) is/are
supporting img

1 the product is a mixture of two compounds

2 the product is a optically active

3 the product is a mixture of two chiral and one achiral stereoisomers

4 the product is a mixture of four stereoisomers

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323509 Statement A :
The reaction of aldehydes and ketones with pure $HCN$ is very slow to yield cyanohydrin.
Statement B :
The above reaction is catalysed by a base and generated cyanide ion being a weaker nucleophile adds to carbonyl compounds to yield, corresponding cyanohydrin.

1 Statement A is correct but Statement B is incorrect.

2 Statement A is incorrect but Statement B is correct.

3 Both statements are correct.

4 Both Statements are incorrect.

Explanation:

Aldehydes and ketones react with hydrogen cyanide to yield cyanohydrins. This reaction occurs very slowly with pure $HCN$ .
Therefore, it is catalysed by a base and the generated cyanide ion $({CN}^{-})$ being a stronger nucleophile readily adds to carbonyl compounds to yield corresponding cyanohydrin.
$H C N + O H^{-} \to \overset{―}{C} N + H_{2} O$
supporting img

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323510 Assertion :
Urotropine is used as medicine in case of urinary trobules.
Reason :
${CH}_{3} CHO$ reacts with ${NH}_{3}$ to form urotropine.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

Formaldehyde $(HCHO)$ can undergo a reaction with ammonia $({NH}_{3})$ to produce urotropine (hexamethylenetetramine), a cyclic compound with the formula ${({CH}_{2})}_{6} N_{4}$ .
$6 HCHO + 4 {NH}_{3} \to {({CH}_{2})}_{6} N_{4} + 6 H_{2} O$
So the option (3) is correct.

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323511 Assertion :
Addition of $HCN$ to carbonyl compounds gives cyanohydrins.
Reason :
Pure HCN reacts with aldehydes and ketones.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

$HCN$ is generally considered a weak acid with a low degree of dissociation. However, in the presence of a base, even something as simple as water $(H_{2} O)$ , the dissociation of $HCN$ increases significantly. This enhanced dissociation yields a notable amount of ${CN}^{-}$ ions, which are then available to participate in nucleophilic attacks on chemical bonds. So the option (3) is correct .

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323512 During nucleophilic addition of ${NaHSO}_{3}$ to carbonyl group, the oxidation number of sulphur is changed from ____ to ____?

1 +4 to +6

2 +4 to +5

3 +4 to +3

4 +4 to +2

Explanation:

Oxidation state of $S$ in ${NaHSO}_{3}$ is +4
During nucleophile addition reaction it exists in +6 oxidation state.

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323508 The correct statement (s) is/are
supporting img

1 the product is a mixture of two compounds

2 the product is a optically active

3 the product is a mixture of two chiral and one achiral stereoisomers

4 the product is a mixture of four stereoisomers

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323509 Statement A :
The reaction of aldehydes and ketones with pure $HCN$ is very slow to yield cyanohydrin.
Statement B :
The above reaction is catalysed by a base and generated cyanide ion being a weaker nucleophile adds to carbonyl compounds to yield, corresponding cyanohydrin.

1 Statement A is correct but Statement B is incorrect.

2 Statement A is incorrect but Statement B is correct.

3 Both statements are correct.

4 Both Statements are incorrect.

Explanation:

Aldehydes and ketones react with hydrogen cyanide to yield cyanohydrins. This reaction occurs very slowly with pure $HCN$ .
Therefore, it is catalysed by a base and the generated cyanide ion $({CN}^{-})$ being a stronger nucleophile readily adds to carbonyl compounds to yield corresponding cyanohydrin.
$H C N + O H^{-} \to \overset{―}{C} N + H_{2} O$
supporting img

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323510 Assertion :
Urotropine is used as medicine in case of urinary trobules.
Reason :
${CH}_{3} CHO$ reacts with ${NH}_{3}$ to form urotropine.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

Formaldehyde $(HCHO)$ can undergo a reaction with ammonia $({NH}_{3})$ to produce urotropine (hexamethylenetetramine), a cyclic compound with the formula ${({CH}_{2})}_{6} N_{4}$ .
$6 HCHO + 4 {NH}_{3} \to {({CH}_{2})}_{6} N_{4} + 6 H_{2} O$
So the option (3) is correct.

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323511 Assertion :
Addition of $HCN$ to carbonyl compounds gives cyanohydrins.
Reason :
Pure HCN reacts with aldehydes and ketones.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

$HCN$ is generally considered a weak acid with a low degree of dissociation. However, in the presence of a base, even something as simple as water $(H_{2} O)$ , the dissociation of $HCN$ increases significantly. This enhanced dissociation yields a notable amount of ${CN}^{-}$ ions, which are then available to participate in nucleophilic attacks on chemical bonds. So the option (3) is correct .

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323512 During nucleophilic addition of ${NaHSO}_{3}$ to carbonyl group, the oxidation number of sulphur is changed from ____ to ____?

1 +4 to +6

2 +4 to +5

3 +4 to +3

4 +4 to +2

Explanation:

Oxidation state of $S$ in ${NaHSO}_{3}$ is +4
During nucleophile addition reaction it exists in +6 oxidation state.

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323508 The correct statement (s) is/are
supporting img

1 the product is a mixture of two compounds

2 the product is a optically active

3 the product is a mixture of two chiral and one achiral stereoisomers

4 the product is a mixture of four stereoisomers

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323509 Statement A :
The reaction of aldehydes and ketones with pure $HCN$ is very slow to yield cyanohydrin.
Statement B :
The above reaction is catalysed by a base and generated cyanide ion being a weaker nucleophile adds to carbonyl compounds to yield, corresponding cyanohydrin.

1 Statement A is correct but Statement B is incorrect.

2 Statement A is incorrect but Statement B is correct.

3 Both statements are correct.

4 Both Statements are incorrect.

Explanation:

Aldehydes and ketones react with hydrogen cyanide to yield cyanohydrins. This reaction occurs very slowly with pure $HCN$ .
Therefore, it is catalysed by a base and the generated cyanide ion $({CN}^{-})$ being a stronger nucleophile readily adds to carbonyl compounds to yield corresponding cyanohydrin.
$H C N + O H^{-} \to \overset{―}{C} N + H_{2} O$
supporting img

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323510 Assertion :
Urotropine is used as medicine in case of urinary trobules.
Reason :
${CH}_{3} CHO$ reacts with ${NH}_{3}$ to form urotropine.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

Formaldehyde $(HCHO)$ can undergo a reaction with ammonia $({NH}_{3})$ to produce urotropine (hexamethylenetetramine), a cyclic compound with the formula ${({CH}_{2})}_{6} N_{4}$ .
$6 HCHO + 4 {NH}_{3} \to {({CH}_{2})}_{6} N_{4} + 6 H_{2} O$
So the option (3) is correct.

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323511 Assertion :
Addition of $HCN$ to carbonyl compounds gives cyanohydrins.
Reason :
Pure HCN reacts with aldehydes and ketones.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

$HCN$ is generally considered a weak acid with a low degree of dissociation. However, in the presence of a base, even something as simple as water $(H_{2} O)$ , the dissociation of $HCN$ increases significantly. This enhanced dissociation yields a notable amount of ${CN}^{-}$ ions, which are then available to participate in nucleophilic attacks on chemical bonds. So the option (3) is correct .

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323512 During nucleophilic addition of ${NaHSO}_{3}$ to carbonyl group, the oxidation number of sulphur is changed from ____ to ____?

1 +4 to +6

2 +4 to +5

3 +4 to +3

4 +4 to +2

Explanation:

Oxidation state of $S$ in ${NaHSO}_{3}$ is +4
During nucleophile addition reaction it exists in +6 oxidation state.

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323508 The correct statement (s) is/are
supporting img

1 the product is a mixture of two compounds

2 the product is a optically active

3 the product is a mixture of two chiral and one achiral stereoisomers

4 the product is a mixture of four stereoisomers

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323509 Statement A :
The reaction of aldehydes and ketones with pure $HCN$ is very slow to yield cyanohydrin.
Statement B :
The above reaction is catalysed by a base and generated cyanide ion being a weaker nucleophile adds to carbonyl compounds to yield, corresponding cyanohydrin.

1 Statement A is correct but Statement B is incorrect.

2 Statement A is incorrect but Statement B is correct.

3 Both statements are correct.

4 Both Statements are incorrect.

Explanation:

Aldehydes and ketones react with hydrogen cyanide to yield cyanohydrins. This reaction occurs very slowly with pure $HCN$ .
Therefore, it is catalysed by a base and the generated cyanide ion $({CN}^{-})$ being a stronger nucleophile readily adds to carbonyl compounds to yield corresponding cyanohydrin.
$H C N + O H^{-} \to \overset{―}{C} N + H_{2} O$
supporting img

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323510 Assertion :
Urotropine is used as medicine in case of urinary trobules.
Reason :
${CH}_{3} CHO$ reacts with ${NH}_{3}$ to form urotropine.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

Formaldehyde $(HCHO)$ can undergo a reaction with ammonia $({NH}_{3})$ to produce urotropine (hexamethylenetetramine), a cyclic compound with the formula ${({CH}_{2})}_{6} N_{4}$ .
$6 HCHO + 4 {NH}_{3} \to {({CH}_{2})}_{6} N_{4} + 6 H_{2} O$
So the option (3) is correct.

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323511 Assertion :
Addition of $HCN$ to carbonyl compounds gives cyanohydrins.
Reason :
Pure HCN reacts with aldehydes and ketones.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

$HCN$ is generally considered a weak acid with a low degree of dissociation. However, in the presence of a base, even something as simple as water $(H_{2} O)$ , the dissociation of $HCN$ increases significantly. This enhanced dissociation yields a notable amount of ${CN}^{-}$ ions, which are then available to participate in nucleophilic attacks on chemical bonds. So the option (3) is correct .

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323512 During nucleophilic addition of ${NaHSO}_{3}$ to carbonyl group, the oxidation number of sulphur is changed from ____ to ____?

1 +4 to +6

2 +4 to +5

3 +4 to +3

4 +4 to +2

Explanation:

Oxidation state of $S$ in ${NaHSO}_{3}$ is +4
During nucleophile addition reaction it exists in +6 oxidation state.

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323508 The correct statement (s) is/are
supporting img

1 the product is a mixture of two compounds

2 the product is a optically active

3 the product is a mixture of two chiral and one achiral stereoisomers

4 the product is a mixture of four stereoisomers

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323509 Statement A :
The reaction of aldehydes and ketones with pure $HCN$ is very slow to yield cyanohydrin.
Statement B :
The above reaction is catalysed by a base and generated cyanide ion being a weaker nucleophile adds to carbonyl compounds to yield, corresponding cyanohydrin.

1 Statement A is correct but Statement B is incorrect.

2 Statement A is incorrect but Statement B is correct.

3 Both statements are correct.

4 Both Statements are incorrect.

Explanation:

Aldehydes and ketones react with hydrogen cyanide to yield cyanohydrins. This reaction occurs very slowly with pure $HCN$ .
Therefore, it is catalysed by a base and the generated cyanide ion $({CN}^{-})$ being a stronger nucleophile readily adds to carbonyl compounds to yield corresponding cyanohydrin.
$H C N + O H^{-} \to \overset{―}{C} N + H_{2} O$
supporting img

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323510 Assertion :
Urotropine is used as medicine in case of urinary trobules.
Reason :
${CH}_{3} CHO$ reacts with ${NH}_{3}$ to form urotropine.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

Formaldehyde $(HCHO)$ can undergo a reaction with ammonia $({NH}_{3})$ to produce urotropine (hexamethylenetetramine), a cyclic compound with the formula ${({CH}_{2})}_{6} N_{4}$ .
$6 HCHO + 4 {NH}_{3} \to {({CH}_{2})}_{6} N_{4} + 6 H_{2} O$
So the option (3) is correct.

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323511 Assertion :
Addition of $HCN$ to carbonyl compounds gives cyanohydrins.
Reason :
Pure HCN reacts with aldehydes and ketones.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

$HCN$ is generally considered a weak acid with a low degree of dissociation. However, in the presence of a base, even something as simple as water $(H_{2} O)$ , the dissociation of $HCN$ increases significantly. This enhanced dissociation yields a notable amount of ${CN}^{-}$ ions, which are then available to participate in nucleophilic attacks on chemical bonds. So the option (3) is correct .

CHXII12:ALDEHYDES KETONES AND CARBOXYLIC ACIDS

323512 During nucleophilic addition of ${NaHSO}_{3}$ to carbonyl group, the oxidation number of sulphur is changed from ____ to ____?

1 +4 to +6

2 +4 to +5

3 +4 to +3

4 +4 to +2

Explanation:

Oxidation state of $S$ in ${NaHSO}_{3}$ is +4
During nucleophile addition reaction it exists in +6 oxidation state.

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